/* jslint node: true */
'use strict';

//	ENiGMA½
const MenuModule			= require('./menu_module.js').MenuModule;
const ViewController		= require('./view_controller.js').ViewController;
const DownloadQueue			= require('./download_queue.js');
const theme					= require('./theme.js');
const ansi					= require('./ansi_term.js');
const Errors				= require('./enig_error.js').Errors;
const stringFormat			= require('./string_format.js');
const FileAreaWeb			= require('./file_area_web.js');
const ErrNotEnabled			= require('./enig_error.js').ErrorReasons.NotEnabled;
const Config				= require('./config.js').config;

//	deps
const async					= require('async');
const _						= require('lodash');
const moment				= require('moment');

exports.moduleInfo = {
	name		: 'File Base Download Web Queue Manager',
	desc		: 'Module for interacting with web backed download queue/batch',
	author		: 'NuSkooler',
};

const FormIds = {
	queueManager	: 0
};

const MciViewIds = {
	queueManager : {
		queue				: 1,
		navMenu				: 2,

		customRangeStart	: 10,
	}
};

exports.getModule = class FileBaseWebDownloadQueueManager extends MenuModule {

	constructor(options) {
		super(options);

		this.dlQueue = new DownloadQueue(this.client);

		this.menuMethods = {
			removeItem : (formData, extraArgs, cb) => {
				const selectedItem = this.dlQueue.items[formData.value.queueItem];
				if(!selectedItem) {
					return cb(null);
				}

				this.dlQueue.removeItems(selectedItem.fileId);

				//	:TODO: broken: does not redraw menu properly - needs fixed!
				return this.removeItemsFromDownloadQueueView(formData.value.queueItem, cb);
			},
			clearQueue : (formData, extraArgs, cb) => {
				this.dlQueue.clear();

				//	:TODO: broken: does not redraw menu properly - needs fixed!
				return this.removeItemsFromDownloadQueueView('all', cb);
			},
			getBatchLink : (formData, extraArgs, cb) => {
				return this.generateAndDisplayBatchLink(cb);
			}
		};
	}

	initSequence() {
		if(0 === this.dlQueue.items.length) {
			return this.gotoMenu(this.menuConfig.config.emptyQueueMenu || 'fileBaseDownloadManagerEmptyQueue');
		}

		const self = this;

		async.series(
			[
				function beforeArt(callback) {
					return self.beforeArt(callback);
				},
				function display(callback) {
					return self.displayQueueManagerPage(false, callback);
				}
			],
			() => {
				return self.finishedLoading();
			}
		);
	}

	removeItemsFromDownloadQueueView(itemIndex, cb) {
		const queueView = this.viewControllers.queueManager.getView(MciViewIds.queueManager.queue);
		if(!queueView) {
			return cb(Errors.DoesNotExist('Queue view does not exist'));
		}

		if('all' === itemIndex) {
			queueView.setItems([]);
			queueView.setFocusItems([]);
		} else {
			queueView.removeItem(itemIndex);
		}

		queueView.redraw();
		return cb(null);
	}

	displayFileInfoForFileEntry(fileEntry) {
		this.updateCustomViewTextsWithFilter(
			'queueManager',
			MciViewIds.queueManager.customRangeStart, fileEntry,
			{ filter : [ '{webDlLink}', '{webDlExpire}', '{fileName}' ] }	//	:TODO: Others....
		);
	}

	updateDownloadQueueView(cb) {
		const queueView = this.viewControllers.queueManager.getView(MciViewIds.queueManager.queue);
		if(!queueView) {
			return cb(Errors.DoesNotExist('Queue view does not exist'));
		}

		const queueListFormat		= this.menuConfig.config.queueListFormat || '{webDlLink}';
		const focusQueueListFormat	= this.menuConfig.config.focusQueueListFormat || queueListFormat;

		queueView.setItems(this.dlQueue.items.map( queueItem => stringFormat(queueListFormat, queueItem) ) );
		queueView.setFocusItems(this.dlQueue.items.map( queueItem => stringFormat(focusQueueListFormat, queueItem) ) );

		queueView.on('index update', idx => {
			const fileEntry = this.dlQueue.items[idx];
			this.displayFileInfoForFileEntry(fileEntry);
		});

		queueView.redraw();
		this.displayFileInfoForFileEntry(this.dlQueue.items[0]);

		return cb(null);
	}

	generateAndDisplayBatchLink(cb) {
		const expireTime = moment().add(Config.fileBase.web.expireMinutes, 'minutes');

		FileAreaWeb.createAndServeTempBatchDownload(
			this.client,
			this.dlQueue.items,
			{
				expireTime : expireTime
			},
			(err, webBatchDlLink) => {
				//	:TODO: handle not enabled -> display such
				if(err) {
					return cb(err);
				}

				const webDlExpireTimeFormat = this.menuConfig.config.webDlExpireTimeFormat || 'YYYY-MMM-DD @ h:mm';

				const formatObj = {
					webBatchDlLink		: ansi.vtxHyperlink(this.client, webBatchDlLink) + webBatchDlLink,
					webBatchDlExpire	: expireTime.format(webDlExpireTimeFormat),
				};

				this.updateCustomViewTextsWithFilter(
					'queueManager',
					MciViewIds.queueManager.customRangeStart,
					formatObj,
					{ filter : Object.keys(formatObj).map(k => '{' + k + '}' ) }
				);

				return cb(null);
			}
		);
	}

	displayQueueManagerPage(clearScreen, cb) {
		const self = this;

		async.series(
			[
				function prepArtAndViewController(callback) {
					return self.displayArtAndPrepViewController('queueManager', { clearScreen : clearScreen }, callback);
				},
				function prepareQueueDownloadLinks(callback) {
					const webDlExpireTimeFormat = self.menuConfig.config.webDlExpireTimeFormat || 'YYYY-MMM-DD @ h:mm';

					async.each(self.dlQueue.items, (fileEntry, nextFileEntry) => {
						FileAreaWeb.getExistingTempDownloadServeItem(self.client, fileEntry, (err, serveItem) => {
							if(err) {
								if(ErrNotEnabled === err.reasonCode) {
									return nextFileEntry(err);	//	we should have caught this prior
								}

								const expireTime = moment().add(Config.fileBase.web.expireMinutes, 'minutes');

								FileAreaWeb.createAndServeTempDownload(
									self.client,
									fileEntry,
									{ expireTime : expireTime },
									(err, url) => {
										if(err) {
											return nextFileEntry(err);
										}

										fileEntry.webDlLinkRaw	= url;
										fileEntry.webDlLink		= ansi.vtxHyperlink(self.client, url) + url;
										fileEntry.webDlExpire	= expireTime.format(webDlExpireTimeFormat);

										return nextFileEntry(null);
									}
								);
							} else {
								fileEntry.webDlLinkRaw	= serveItem.url;
								fileEntry.webDlLink		= ansi.vtxHyperlink(self.client, serveItem.url) + serveItem.url;
								fileEntry.webDlExpire	= moment(serveItem.expireTimestamp).format(webDlExpireTimeFormat);
								return nextFileEntry(null);
							}
						});
					}, err => {
						return callback(err);
					});
				},
				function populateViews(callback) {
					return self.updateDownloadQueueView(callback);
				}
			],
			err => {
				if(cb) {
					return cb(err);
				}
			}
		);
	}

	displayArtAndPrepViewController(name, options, cb) {
		const self		= this;
		const config	= this.menuConfig.config;

		async.waterfall(
			[
				function readyAndDisplayArt(callback) {
					if(options.clearScreen) {
						self.client.term.rawWrite(ansi.resetScreen());
					}

					theme.displayThemedAsset(
						config.art[name],
						self.client,
						{ font : self.menuConfig.font, trailingLF : false },
						(err, artData) => {
							return callback(err, artData);
						}
					);
				},
				function prepeareViewController(artData, callback) {
					if(_.isUndefined(self.viewControllers[name])) {
						const vcOpts = {
							client		: self.client,
							formId		: FormIds[name],
						};

						if(!_.isUndefined(options.noInput)) {
							vcOpts.noInput = options.noInput;
						}

						const vc = self.addViewController(name, new ViewController(vcOpts));

						const loadOpts = {
							callingMenu		: self,
							mciMap			: artData.mciMap,
							formId			: FormIds[name],
						};

						return vc.loadFromMenuConfig(loadOpts, callback);
					}

					self.viewControllers[name].setFocus(true);
					return callback(null);

				},
			],
			err => {
				return cb(err);
			}
		);
	}
};